WoW

Fancy some eggs, or wanna slay like Bey for a tenner? Then check out Facebook's new Marketplace, which quickly went from innocently selling baby photoshoots, to a used car (with no brakes), to selling drugs to your Mom.

Early in the morning of Sept. 1, 2016, NASA’s Solar Dynamics Observatory, or SDO, caught both Earth and the moon crossing in front of the sun. SDO keeps a constant eye on the sun, but during SDO’s semiannual eclipse seasons, Earth briefly blocks SDO’s line of sight each day – a consequence of SDO’s geosynchronous orbit. On Sept. 1, Earth completely eclipsed the sun from SDO’s perspective just as the moon began its journey across the face of the sun. The end of the Earth eclipse happened just in time for SDO to catch the final stages of the lunar transit. In the SDO data, you can tell Earth and the moon’s shadows apart by their edges: Earth’s is fuzzy, while the moon’s is sharp and distinct. This is because Earth’s atmosphere absorbs some of the sun’s light, creating an ill-defined edge. On the other hand, the moon has no atmosphere, producing a crisp horizon. This particular geometry of Earth, the moon and the sun had effects on viewing down on the ground as well: It resulted in a simultaneous eclipse visible from southern Africa. The eclipse was what's known as a ring of fire, or annular, eclipse, which is similar to a total solar eclipse, except it happens when the moon is at a point in its orbit farther from Earth than average. The increased distance causes the moon’s apparent size to be smaller, so it doesn't block the entire face of the sun. This leaves a bright, narrow ring of the solar surface visible, looking much like a ring of fire. http://go.nasa.gov/2clNBFs

Ever wonder how your Grandpa would compare with an Olympian at their own sport?

Well, some scientists did, and they set up an experiment with seniors doing the same activities as Olympians and then measured the difference between the Olympian's record and the centenarian's. Specifically, Usain Bolt, who ran the 100-metre in 9.58 seconds...

...with, say, Donald Pellman, a competitor in the 100 to 104 age-group, who did the same event in 26.99 seconds, which was only a 64.5 percent decrease in performance compared with Bolt.

The centenarian athlete who showed the lowest percent decrease in performance between an Olympian and himself was Robert Marchand, a Frenchman, who holds the world record for his age group in 1-hour track cycling. He cycled only 50.6 percent slower than Bradly Wiggin's record.

After 40, our performance decreases by about 10 to 15 percent per decade usually, so you'd better start running now if you want to catch these Grandpas.